cosmetic: lapdm: Fix typo in comment

Change-Id: I5cf9aea6ba072bd1ccb3e894c0a311844bcad8df
diff --git a/src/gsm/rsl.c b/src/gsm/rsl.c
index 3668cea..fbba982 100644
--- a/src/gsm/rsl.c
+++ b/src/gsm/rsl.c
@@ -553,7 +553,7 @@
 	/* construct a RSLms RLL message (DATA INDICATION, UNIT DATA
 	 * INDICATION) and send it off via RSLms */
 
-	/* Push the L3 IE tag and lengh */
+	/* Push the L3 IE tag and length */
 	msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len);
 
 	/* Then push the RSL header */